The influence of various phytomeliorants on the content and reserves of humus, the content of microelements, microflora and optical parameters of agrogenic soils of Primorye were studied. Sowing legumes with annual and perennial crops activates the processes of humus accumulation, increases the biogenicity and catalase activity of soils. The most positive effect on the increase in humus content, catalase activity and soil biogenicity in the experiment with annual grasses was noted for the “oats + vetch” guide. Humus reserves reached the level of average values. In the variant of the experiment, “oats + beans”, the amount of humus and its reserves in the 20 cm layer decreased due to waterlogging of the soil and the weakening of the processes of transformation of organic matter by microflora. In the experiment with perennial grasses, the highest humus content and indicators of catalase activity were recorded for the “timothy grass + alfalfa” variant, the “timothy grass + clover + alfalfa” variant differed in the largest reserves of humus and biogenicity. Due to the decrease in the density of soil composition, in the variant with the sowing of the grass mixture of timothy “grass + alfalfa”, the humus reserves in the 20 cm layer decreased slightly (to 108.6 t/ha). A close inverse correlation was established between the addition of humus and the integral reflection. When considering with regional clarke values, an imbalance in the microelement composition of the studied soil samples of the upper horizon was revealed.